摘要
对不同热处理状态的2mm厚30CrMnSiA高强钢进行了搅拌摩擦焊接,焊接参数分别为:旋转速度250r/min,焊接速度30mm/min,分别对试板进行了焊前热处理、焊后热处理及未热处理。结果表明:热处理能够显著提升焊接接头力学性能,尤其是焊前热处理的过程,能够得到高强度的马氏体组织,且使得在相同条件下这种工艺所得到的焊前晶粒最细小,由此能够在拉伸测试中展现出更高的强度;而焊后热处理后由于较多含有塑性较好的铁素体,也能够展现出高的抗拉强度。
Friction stir welding was carried out on 2mm thick 30CrMnSiA high-strength steel in different heat treatment states.The welding parameters are as follows:rotation speed is 250r/min,welding speed is 30mm/min.The test plates were subjected to pre-welding heat treatment,post-welding heat treatment and non-heat treatment.The results show that heat treatment can significantly improve the mechanical properties of welded joints.Especially the pre-welding heat treatment process,the pre-weld heat treatment process results in a high-strength martensitic organization with the smallest pre-weld grain size of any process under the same conditions,which results in higher strengths in tensile tests;The post-weld heat treatment due to the more plastic ferrite,can also show high tensile strength.
作者
仇一卿
袁杏
陆伟
何强
姚徐伟
倪林斌
QIU Yiqing;YUAN Xing;LU Wei;HE Qiang;YAO Xuwei;NI Linbin(Shanghai Spaceflight Precision Machinery Research Institute,Shanghai 201600,China)
关键词
30CRMNSIA钢
搅拌摩擦焊
热处理
组织
力学性能
30CrMnSiA steel
friction stir welding
heat treatment
microstructure
mechanical property
